@article{Rosenzweig1980,
author = {Rosenzweig, M.R. and Wolpin, K.I.},
title= {Testing the Quantity-Quality Fertility Model: The Use of Twins as a Natural Experiment},
year = {1980},
doi = {10.2307/1912026},
journal = {Econometrica},
volume = {48},
number = {1},
pages = {227--240},
}